Malicious PDF — malware analysis report

Static analysis result for SHA-256 8187f224ad4012c9…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 11:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e1df8e8d8ed0046a2d57dfb137cf82cc SHA-1: 557ce1aa1f1ca2c248443413651fd13e80a80b2c SHA-256: 8187f224ad4012c91acfb3b9f640d6597224abe29537e487f6980566db6d6179
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://incomsistema.ru/ckfinder/userfiles/files/95299521257.pdf In PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/pajilojak.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/13646953679.pdfIn PDF document text
    • http://iccarrentals.com/files/file/zijudiw.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee3af775c3---57242108383.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16135f3d36c878---pexosanidepukivi.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/65540597811.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2b1452e8a---xilepanofu.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313af70289e---nisopu.pdfIn PDF document text
    • http://snsi.jp/image/news_file/wigebukevamoniguk.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/65066065645.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b10c51bd2---wosawe.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/zasanefiroxixami.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/96414509014.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/fadupovak.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/b2ade1255bcffd6a092d0b7cc445614e/tudejagidatim.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/u5e87gkpjp6kqe4ohhv37ub16c/5352790503.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/deralalirabem.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/zotufotawuporugofaju.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/53503012674.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5phgglcst9spjlv1fs0todlv37/54569223898.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/riremezopezeritu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+bluetooth+showing+mac+addressPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7E 11124 bytes
SHA-256: 2a7fe22ce6e519ed0f751108dafb638f6f4f85eaecf27231a049168b79111b97
font_01_sfnt_off0000c822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC822 14840 bytes
SHA-256: 8ceb6881638d635f4e7dccacd0a0c0a2073818637803fca3bc7e697a8557d3f0
font_02_sfnt_off0000ed13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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